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1. Two trains start at the same time for two station A and B toward B and A respectively. If the distance between A and B is 220 km and their speeds are 50 km/hr and 60 km/hr respectively then after how much time will they meet each other?

A. 2 hr

B. $2 \frac{1}{2}$ hr

C. 3 hr

D. 1 hr

Solution:

\begin{aligned} Relative speed \\ =   60  +  50 \\ =  110 km/h \\ Time taken \\ = \frac{220}{110} \\ =  2 hr \end{aligned}

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